def test_exchange_amount(self):
five_dollars = Bank.exchange(Money(5, "USD"))
self.assertEqual(Money(5, "USD"), five_dollars)
ten_francs = Bank.exchange(Money(10, "CHF"))
self.assertEqual(Money(5, "USD"), ten_francs)
eleven_francs = Bank.exchange(Money(11, "CHF"))
self.assertEqual(Money(5.5, "USD"), eleven_francs)
def test_reduce_money_different_currency():
bank = Bank()
bank.add_rate("CHF", "USD", 2)
result = bank.exchange(Money.francs(2), "USD")
assert Money.dollar(1) == result
def test_simple_addition():
five = Money.dollar(5)
money_sum = five + five
bank = Bank()
reduced = bank.exchange(money_sum, "USD")
assert Money.dollar(10) == reduced
def test_mixed_addition():
five_bucks = Money.dollar(5)
ten_francs = Money.francs(10)
bank = Bank()
bank.add_rate("CHF", "USD", 2)
result = five_bucks + bank.exchange(ten_francs, "USD")
assert result == Money.dollar(10)